They don't need to come off the car. If you want to do it right then yes they do. I had mine cut apart, gutted, smoothed and rewelded. The alt doesn't have to go anywhere so whomever told you that is F.O.S. The MIL eliminator stuff can be found by a search so I'm not searching for you.

-'96 SE MTX 3L -'98 SVT 1,173 of 6,535 -'05 Mazda 6s, loaded, g/f's ride -Need a 96-00 manual on CD? PM or email me